PrinterLayoutAsyncLayer¶
Namespace: ThinkGeo.Core
Provides the base functionality for layers that render within a printer layout.
public abstract class PrinterLayoutAsyncLayer : AsyncLayer
Inheritance object → LayerBase → AsyncLayer → PrinterLayoutAsyncLayer
Remarks:
Positions are expressed in PrintingUnit.Point by default, which ThinkGeo defines as 1/96 inch rather than the typographic 1/72 inch, so an ANSI A sheet is 816 x 1056 of them. Use PrinterLayoutAsyncLayer.GetPosition(PrintingUnit) and PrinterLayoutAsyncLayer.SetPosition(RectangleShape, PrintingUnit) to work in inches, millimetres or centimetres instead, and PdfGeoCanvas.SetPageSize(PagePrinterLayoutAsyncLayer) to size a PDF page from a layout without converting anything yourself.
Properties¶
HasBoundingBox¶
Gets a value indicating that printer layers always expose a bounding box.
public bool HasBoundingBox { get; }
Property Value¶
BackgroundMask¶
Gets or sets the fill and outline mask drawn beneath the layer content.
public AreaStyle BackgroundMask { get; set; }
Property Value¶
ResizeMode¶
Gets or sets how the layer responds to resize operations.
public PrinterResizeMode ResizeMode { get; set; }
Property Value¶
DragMode¶
Gets or sets how the layer responds to drag operations in the layout designer.
public PrinterDragMode DragMode { get; set; }
Property Value¶
IsResizing¶
Gets or sets a value indicating whether the layer is currently being resized.
public bool IsResizing { get; set; }
Property Value¶
SelectabilityMode¶
Gets or sets whether the layer can be selected in the layout designer.
public PrinterLayerSelectabilityMode SelectabilityMode { get; set; }
Property Value¶
Name¶
Gets or sets the display name for the layer.
public string Name { get; set; }
Property Value¶
string
The name used to identify the layer within UI components such as legends.
Remarks:
The name is user defined. Assign a descriptive value so tooling such as legends and layer lists can surface a meaningful label to end users.
IsOpen¶
Gets a value indicating whether the layer is currently open.
public bool IsOpen { get; }
Property Value¶
bool
true if the layer has completed its open routine; otherwise, false.
Remarks:
This method is the concrete wrapper for the abstract method IsOpenCore. Various methods on the Layer require that it be in an open state. If one of those methods is called when the state is not open, then the method will throw an exception. To enter the open state, you must call the Layer Open method. The method will raise an exception if the current Layer is already open.
As this is a concrete public method that wraps a Core method, we reserve the right to add events and other logic to pre- or post-process data returned by the Core version of the method. In this way, we leave our framework open on our end, but also allow you the developer to extend our logic to suit your needs. If you have questions about this, please contact our support team as we would be happy to work with you on extending our framework.
IsVisible¶
Gets or sets a value indicating whether the layer is visible.
public bool IsVisible { get; set; }
Property Value¶
bool
true to draw the layer; otherwise, false.
Remarks:
If this property is set to false, the layer will not draw. We ensure this in the Draw method. This is useful for legends and other controls that control the visibility of layers.
Projection¶
Gets the projection of the layer.
public Projection Projection { get; set; }
Property Value¶
DrawingExceptionMode¶
Gets or sets how drawing exceptions are handled when the layer renders.
public DrawingExceptionMode DrawingExceptionMode { get; set; }
Property Value¶
Background¶
Gets or sets the background color used when rendering the layer.
public GeoColor Background { get; set; }
Property Value¶
GeoColor
The fill applied to areas not covered by layer content.
Transparency¶
Gets or sets the amount of transparency applied to the rendered image.
public float Transparency { get; set; }
Property Value¶
float
A value between 0 (fully transparent) and 255 (fully opaque).
Opacity¶
Gets or sets the opacity applied to the rendered image.
public float Opacity { get; set; }
Property Value¶
float
A value between 0.0 (fully transparent) and 1.0 (fully opaque).
BlueTranslation¶
Gets or sets the intensity adjustment applied to the blue channel.
public float BlueTranslation { get; set; }
Property Value¶
float
A value between -255 and 255 representing the blue channel translation.
RedTranslation¶
Gets or sets the intensity adjustment applied to the red channel.
public float RedTranslation { get; set; }
Property Value¶
float
A value between -255 and 255 representing the red channel translation.
GreenTranslation¶
Gets or sets the intensity adjustment applied to the green channel.
public float GreenTranslation { get; set; }
Property Value¶
float
A value between -255 and 255 representing the green channel translation.
KeyColors¶
Gets the collection of key colors that should be rendered as transparent.
public Collection<GeoColor> KeyColors { get; }
Property Value¶
Remarks:
Attempting to access this collection when the associated GeoCanvas does not support key colors (see GeoCanvas.SupportKeyColor) results in an exception. Add colors to this collection to ensure they render as transparent.
IsNegative¶
Gets or sets a value indicating whether the image should be rendered with inverted colors.
public bool IsNegative { get; set; }
Property Value¶
bool
true to invert the color channels; otherwise, false.
IsGrayscale¶
Gets or sets a value indicating whether the image should be converted to grayscale prior to rendering.
public bool IsGrayscale { get; set; }
Property Value¶
bool
true to apply a grayscale filter; otherwise, false.
ConcurrentAccess¶
Gets or sets how this layer behaves when more than one thread wants to draw it at once, and what a caller who wants concurrency should therefore do with it.
public ConcurrentAccess ConcurrentAccess { get; set; }
Property Value¶
ConcurrentAccess
unless the layer says otherwise: callers take turns on the one instance, which is what the screen renderer has done with a layer that did not say otherwise since this question was first asked.
Remarks:
A FeatureLayer that is not given a value of its own answers with its FeatureLayer.FeatureSource's, so a layer and the source it reads through cannot disagree about this.
ThreadSafe¶
Gets or sets the threading guarantees provided by the layer implementation.
public ThreadSafetyLevel ThreadSafe { get; set; }
Property Value¶
ThreadSafetyLevel
The level of thread safety that callers can expect when interacting with the layer.
Remarks:
Replaced by LayerBase.ConcurrentAccess and kept only so that code written against it is told, by name, what to use instead. It does not compile, so there is never a question of which of the two a caller meant: there is one value, and it is the other one. That matters because the translation was lossy in one direction - writing ThreadSafetyLevel.Unsafe could only pick ConcurrentAccess.UnsafeLock, and would silently undo a layer or source that had said ConcurrentAccess.UnsafeClone.
ColorMappings¶
Gets the color translation map that will be applied when rendering the layer.
public Dictionary<GeoColor, GeoColor> ColorMappings { get; }
Property Value¶
Dictionary<GeoColor, GeoColor>
WrappingMode¶
Gets or sets how the layer wraps when the map extent crosses world boundaries.
public WrappingMode WrappingMode { get; set; }
Property Value¶
WrappingExtent¶
Gets or sets the geographic extent to use when wrapping is enabled.
public RectangleShape WrappingExtent { get; set; }
Property Value¶
Methods¶
GetRasterContentTypeCore()¶
Printer layers render vector cartographic content.
protected RasterContentType GetRasterContentTypeCore()
Returns¶
DrawAsyncCore(GeoCanvas, Collection<SimpleCandidate>)¶
Draws the printer layer background mask using the supplied GeoCanvas.
protected Task DrawAsyncCore(GeoCanvas canvas, Collection<SimpleCandidate> labelsInAllLayers)
Parameters¶
canvas GeoCanvas
The canvas that receives the drawing commands.
labelsInAllLayers Collection<SimpleCandidate>
Label candidates collected from all layers.
Returns¶
GetBoundingBoxCore()¶
Returns the current bounding box in printer points.
protected RectangleShape GetBoundingBoxCore()
Returns¶
A()¶
internal RectangleShape A()
Returns¶
GetDynamicBoundingBox()¶
Gets the bounding box that reflects the layer's current state, allowing derived classes to add custom behavior.
public RectangleShape GetDynamicBoundingBox()
Returns¶
GetDynamicBoundingBoxCore()¶
When overridden, returns the bounding box that should be used for drawing at runtime.
protected RectangleShape GetDynamicBoundingBoxCore()
Returns¶
GetPosition()¶
Gets the current position expressed in points.
public RectangleShape GetPosition()
Returns¶
GetPosition(PrintingUnit)¶
Gets the current position expressed in the specified PrintingUnit.
public RectangleShape GetPosition(PrintingUnit unit)
Parameters¶
unit PrintingUnit
The target unit.
Returns¶
GetPositionCore(PrintingUnit)¶
Returns the position for derived classes, allowing overrides to modify the conversion behavior.
protected RectangleShape GetPositionCore(PrintingUnit unit)
Parameters¶
unit PrintingUnit
The unit to convert the stored bounding box to.
Returns¶
SetPosition(RectangleShape)¶
Sets the layer position using the provided bounding box in points.
public void SetPosition(RectangleShape boundingBox)
Parameters¶
boundingBox RectangleShape
The desired bounding box expressed in printer points.
Returns¶
SetPosition(RectangleShape, PrintingUnit)¶
Sets the layer position using the provided bounding box and unit.
public void SetPosition(RectangleShape boundingBox, PrintingUnit unit)
Parameters¶
boundingBox RectangleShape
The target bounding box.
unit PrintingUnit
The unit that the bounding box is expressed in.
Returns¶
SetPosition(double, double, PointShape, PrintingUnit)¶
Sets the layer position using width, height, and a center point.
public void SetPosition(double width, double height, PointShape centerPoint, PrintingUnit unit)
Parameters¶
width double
The width of the layer.
height double
The height of the layer.
centerPoint PointShape
The location of the layer center.
unit PrintingUnit
The unit that the parameters are expressed in.
Returns¶
SetPosition(double, double, double, double, PrintingUnit)¶
Sets the layer position using width, height, and a center coordinate.
public void SetPosition(double width, double height, double centerPointX, double centerPointY, PrintingUnit unit)
Parameters¶
width double
The width of the layer.
height double
The height of the layer.
centerPointX double
The X coordinate of the center.
centerPointY double
The Y coordinate of the center.
unit PrintingUnit
The unit that the parameters are expressed in.
Returns¶
SetPosition(double, double, LayerAnchorLocation, PointShape, PrintingUnit)¶
Sets the layer position using an anchor and its coordinate.
public void SetPosition(double width, double height, LayerAnchorLocation corner, PointShape cornerPoint, PrintingUnit unit)
Parameters¶
width double
The width of the layer.
height double
The height of the layer.
corner LayerAnchorLocation
The anchor location to align.
cornerPoint PointShape
The coordinates of the anchor.
unit PrintingUnit
The unit that the parameters are expressed in.
Returns¶
SetPosition(double, double, LayerAnchorLocation, double, double, PrintingUnit)¶
Sets the layer position using an anchor and its coordinate.
public void SetPosition(double width, double height, LayerAnchorLocation corner, double cornerPointX, double cornerPointY, PrintingUnit unit)
Parameters¶
width double
The width of the layer.
height double
The height of the layer.
corner LayerAnchorLocation
The anchor location to align.
cornerPointX double
The X coordinate of the anchor.
cornerPointY double
The Y coordinate of the anchor.
unit PrintingUnit
The unit that the parameters are expressed in.
Returns¶
SetPositionCore(double, double, double, double, PrintingUnit)¶
Allows derived classes to customize how a bounding box is computed from the supplied measurements.
protected RectangleShape SetPositionCore(double width, double height, double centerPointX, double centerPointY, PrintingUnit unit)
Parameters¶
width double
The width in points.
height double
The height in points.
centerPointX double
The center X coordinate in points.
centerPointY double
The center Y coordinate in points.
unit PrintingUnit
The unit of the supplied measurements.
Returns¶
RectangleShape
The bounding box to store.
Events¶
DrawingException¶
Occurs when the DrawingException event is raised.
public event EventHandler<DrawingExceptionLayerEventArgs> DrawingException;
DrawnException¶
Occurs when the DrawnException event is raised.
public event EventHandler<DrawnExceptionLayerEventArgs> DrawnException;